Method and apparatus for joining broken ends

ABSTRACT

Method and apparatus for rejoining broken thread in a spindleless spinning machine wherein the thread is formed in a turbine and withdrawn. A sensor is provided to sense the breakage of the thread and in response thereto to stop the withdrawl of the thread and of the spinning operation and to institute the cutting of the broken thread and the reversal of the thread into the spinning turbine. The return of the thread and the recommencing of the spinning being timed by an impulse counter initiated by the reversing thread passing the sensor.

United States Patent [191 Battling [451 Dec. 17,1974

[ METHOD AND APPARATUS FOR JOINING BROKEN ENDS [75] Inventor: GerhardBartling, Burgstall,

Germany [73] Assignee: SKF Kugellagerfabriken GmbI-I,

Schweinfurt, Germany [22] Filed: June 20, 1972 [21] Appl. No.: 264,527

[30] Foreign Application Priority Data June 21, 1971 Germany 2130690[52] US. Cl 57/34 R, 57/5895, 57/156 [51] Int. Cl D01h 15/00 [58] Fieldof Search 57/34 R, 58.89-58.95, 57/78, 80, 81, 156

[56] References Cited UNITED STATES PATENTS 3,354,631 11/1967 Elias eta1. 57/5895 3,455,095 7/1969 Makeham et a1. 57/34 R 3,462,936 8/1969Boucek et al 57/5895 3,541,774 11/1970 Sterba et al 3,640,059 2/1972Lutovsky et al. 57/34 R 3,695,017 10/1972 Hori et al 57/34 R FOREIGNPATENTS OR APPLICATIONS 1,213,302 1l/1970 Great Britain 57/58.)5

Primary Examiner-John Petrakes Attorney, Agent, or Firm-Murray Schaffer5 7] ABSTRACT Method and apparatus for rejoining broken thread in aspindleless spinning machine wherein the thread is formed in a turbineand withdrawn. A sensor is provided to sense the breakage of the threadand in response thereto to stop the withdraw] of the thread and of thespinning operation and to institute the cutting of the broken thread andthe reversal of the thread into the spinning turbine. The return of thethread and the recommencing of the spinning being timed by an impulsecounter initiated by the reversing thread passing the sensor.

12 Claims, 3 Drawing Figures METHOD AND APPARATUS FOR JOINING BROKENENDS BACKGROUND OF INVENTION The present invention relates to a methodand apparatus for the respinning of broken thread with the spin ningfiber ring in spindleless spinning machines.

The respinning or joining of broken yarn with newly spun fibers inspindleless apparatus is generally carried out by stopping the spinning,cutting the broken thread and returning the thread to the spinningturbine where the newly spun fibers join with it. This operation isaccompanied by great problems, since in order to make a successfuljuncture, a great number of factors have to be taken into consideration.This is, especially so, if the quality of the spun yarn is not to belessened by any noticeably irregular joining points. First of all, it isnecessary to eliminate the causes for the thread breakage and thereforegenerally a cleaning of the spinning chamber is required. Furthermore,it is necessary that the piece end or broken section of thread beremoved since this piece of yarn usually has the irregularities whichhad caused the breaking of the yarn in the first place. Only aftercleaning the turbine and establishing the clean end suitable forrespinning are the preconditions for successful respinning met.Thereafter, it is necessary that the end of the clean thread which isbrought back into the spinning chamber meets the fiber ring at asuitable speed so that immediately after beginning the splicing process,the withdraw] of the thread out of the spinning chamber with the desireddelivery can be commenced.

Until now none of the prior art has fully satisfied all the pointsnecessary to carry out the respinning operation securely and at a highquality.

It has been found, for instance, in the methods in which timing switchesare employed that the duration of reversal of the thread, and 'on theother hand, of the feeding of the fiber to the spinning chamber isimproperly controlled, on account of unavoidable fluctuations of theperformance of the driving means and the sluggishness of the drivenmachine elements during starting and breaking procedures. In many casesno perfect joining can be obtained, since either the piece of threadwhich was returned is too short, so that no respinning at all can takeplace, or that the returned piece of thread is too long and can not bewithdrawn at the right moment from the turbine. A process of this typeand apparatus for carrying out such a process is described in the GermanPublication DOS 1,560,340.

In order to avoid the above difficulties, it has been attempted to makeapparatus in which a predetermined length of yarn is returned to thechamber. This would have the advantage that the thread, on which therespinning takes place, should arrive exactly at the joining point. Thismethod is, for instance, known from German Patent Publication DOS2,012,108 which describes a machine spinning wherein after cutting ofthe thread end and before return of thread, a thread reserve is formedof defined length. Through this method, a lot of possible mistakes areeliminated, but on the other hand, the fluctuating time factors relatedto the starting of the feeding of fibers to the spinning chamber and thespeed of the yarn delivery can not be dealt with in an exact andefficient manner, which would in each case assure perfect spinningtogether.

From Austrian Pat. No. 252,769 and its corresponding U.S. Pat. No.3,354,631 a device for elimination of breaking threads in a spinningmachine with rotating spinning chamber is known. Here the yarn outletduct is provided with a yarn sensor and a winding spool and a pair oftake-up rollers, coupled to each other by a transmission gear. Thedriving motor and the transmission gear are provided with a reversinggear which, when the thread is broken, are activated by the sensor, sothat the spool and the take-up roller return the thread into thespinning chamber. In addition, a measuring device and a contact which iscontrolled by the same is provided, whereby the take-up rollers and thespool after a number of revolutions are again switched to run forward.

In this known apparatus the length of the thread which is to be returnedis therefore determined by a counter and is supposed to return a definedthread length. This known device, however, shows basically the samedisadvantages as were discussed above in connection with the returndelivery of a defined thread length out of a thread reserve, andadditionally, since there is no cutting device at a defined distancefrom the joining point, the length of the returned yarn is subject touncontrollable changes, due to the irregularities of the breakingoperation.

Starting at this state of the art, the present invention has the objectto provide a method and apparatus for respinning a broken thread in anopen end spinning apparatus, whereby, on the one hand, the returndelivery of a defined thread length is assured, and whereby, on theother hand, it is also assured'that the end reaches the joining orsplicing point on the spinning chamber wall at the right speed and at amoment when a fiber ring of the desired consistency has been attained.

SUMMARY OF INVENTION According to the present invention, the thread end,after a thread break, is cut at a predetermined distance from thesplicing or joining point of the spinning turbine. Only after thiscutting, the return delivery of the thread is commenced. The return istimed by the counting of impulses which are derived from an impulsegenerator which starts counting only, when the cut thread end passes athread sensor, which lies between the cutting means and the joiningpoint.

1t has been found to be advantageous that the return delivery take placeat the same speed as the withdrawl. It is especially advantageous whenthe distance between the sensor and the joining point is chosen in sucha way, that the feeding of the fibers to the spinning chamber iscommenced at the moment at which the thread end passes the sensor, sothat the thread end arrives at the joining point exactly at the timethat a fiber ring of the correct thread density has been formed.

The apparatus is characterized in that the thread take-up rollerscomprise two jointly pivotable rollers of the same diameter, one ofwhich is made to engage a rotating drive roller to withdraw the threadwhile the other roller is made to engage the drive roller for returndelivery of the thread, and which both together are pivotable away fromthe driven roller. Further, an impulse generator is coupled to driveroller so that perfect timing can be obtained. It has been of advantageto pivot the take-up rollers around a common center of gravity by meansof a common element connected with the control circuit.

Further advantages and particulars of the invention are describedhereafter and are shown clearly in the drawing.

BRIEF DESCRIPTION OF DRAWING In the drawings:

FIG. 1 is a plan view of apparatus for carrying out the inventive methodshown during normal spinning procedure;

FIG. 2 is the apparatus according to FIG. 1 in the manufacturingposition after a thread break and when the respinning is being prepared;and

FIG. 3 is the apparatus according to FIGS. 1 and 2 in the manufacturingpostion during the return delivery of the yarn to the spinning chamber.v

The method of the present invention is best described together with theinventive apparatus by which the steps may be carried out. As seen inFIG. 1, a spindleless spinning assembly, generally depicted by thenumeral 1, comprises a rotating spinning turbine 9 mounted within thechamber of an enclosed housing. The construction of the spindle assemblymay be conventional in form and its details are therefore known to thoseskilled in this art. The assembly produces in the known manner a thread3 which is pulled through an outlet channel or tube 8. In accordancewith the present invention an electrical sensor, such as a photoelectriccell 2 cooperating with a light source or similar device is mounted onthe tube 8 to sense the continuity of the thread 3. The thread 3, innormal operation (FIG. 1), is withdrawn from the spinning tubine 9 by apair of take-up rollers or nip rollers 4a and 4b which are biased topress against each other. The rollers 4a and 4h have a smooth outercircumference and are driven by a continuously clockwise rotating wheelor roller which extends across and in contact with each of similarrollers employed along the spindle bank of a multiple spinning assemblymachine. The roller 4a is mounted at the end of a lever which is biasedby a spring 12 to pivot about a point 13 into normal operatingengagement with the drive roller 5. The roller 4!) is mounted at the endof a bell crank 16 also pivoted at the point 13 and biased by a spring 6to press the roller 4b against the surface of roller 4a for conjointswinging and rolling.

The thread 3 passes over a dancer roll and arm 11 which is adapted tooscillate and resiliently accumulate a length of thread in reserveduring the operation of the apparatus. The thread 3 then passes over agrooved drum 10 on which a take-up spool 21 rests. The grooved drum 10rotates the spool 21 and acts to apply the thread in an even manneracross it. The drum l0 and therefore the spool 21 abutting against it isdriven by the roller 4a abutting against the common drive roller 5 via atransmission such as a chain or belt 14 arranged with the axle or shaftfor roller 4a.

The electric sensor 2 is connected to a control circuit schematicallyshown by the numeral 20. The control circuit may employ one or morerelays, solid state amplifier circuits, timing devices, etc. Thephotoelectric sensor suggested is of conventional construction producingan electric signal output on sensing the presence or absence of a givenobject in line withit. In the present situation should the normaloperation of the spinning assembly be disturbed by a break in thethread'3 (see FIG. 2), the sensor 2 produces a signal passing to thecontrol circuit 20. Operatively connected to the control circuit are apair of brake means 17 and 18 which are mounted respectively to stop therotation of either or both of the rollers 4a, 4b and the groove drum 10on command of the control circuit on receipt of a signal inducing abreak in the thread. A two stage actuator 19 such as a double windingsolenoid with magnet core is mounted generally perpendicular to the longarm of the bell crank 16 and is connected to it by a bolt and pin 39.The actuator is adapted to move the lever 16 and to hold it securelyagainst the roller 4a so that both of said rollers 4a, 4b come free ofthe driving roller 5. Simultaneously rollers 4a and 4b are stopped by,

the braking means 17. This stops the movement of the thread 3 andmaintains the length of the thread hanging in the outlet tube 8 belowthe rollers 4a and 4b. The movement of the lever 16 by the actuator 19is limited by a micro-switch or the like arranged at a predetermineddistance from the edge of the lever 16. In stopping the rollers and thegrooved drum 10 the dancer roller and arm 11 acts to provide asufficient length of thread in case spool 21 due to its weight has notyet stopped completely.

Simultaneously with the stopping of the thread movement, the controlcircuit causes a normally closed resiliently biased clutch or coupling25 to open by deenergizing its solenoid coil 24. The clutch 25 normallyoperates the paired feed rollers 26 by which the raw fiber band 27 isfed to the spinning chamber. After a predetermined time delay, thecontrol circuit 20 activates a cutting element 7 which is arrangedbetween the spinning assembly 1 and the rollers 4a and 4h. The cuttingelement 7 is mounted at the end of the tube 8 in axial alignment withthe thread and may be of conventional construction known to thoseskilled in the art. The spinning turbine 9 is maintained under vacuumvia a conduit 31 extending from a source of vacuum 32 such as areservoir or air pump. The piece of thread remaining in the outlet tube8 cut by the cutter 7 is thus carried away together with the other fiberparticles, pulp, etc, present in the spinning chamber. This removes fromthe thread 3 the portion of the thread in which the irregularity causingthe yarn breakage in the first place and leaves a cohesive well formedthread end.

The spinning assembly housing is pivoted at its upper end 29 and isswung from its other end by a second solenoid or similar actuator 28having a rod reciprocable in the path indicated by the arrow. The drivewhorls for the spinning turbine 9 and the fiber picker and-looseningrollers, generally depicted by the numerals 26 and 33, extend out of thehousing. Solenoid 28 is actuated by a signal from the control circuit 20so that the housing is pivoted simultaneously with the application ofbrakes l7 and 18 and the actuation of the first solenoid 19 so that thespinning turbine 9 and the fiber pickers 33 are also disengaged fromtheir drive means as seen in FIG. 2.

As soon as the housing pivots into the position seen in FIG. 2 underaction of actuator 28, it releases a second micro-switch 36 which causesthe control circuit 20 to further activate the actuator 19 to pull theupper arm of bell crank 16 further to the right. This latter movementcauses the roller 4b, which is of the diameter as its companion roller4a, to engage the surface of the drive roller 5. On reaching thisposition (FIG. 3), a latch 23 falls behind the upper arm of the lever 16overcoming the effect of spring 12 and holding the lever 16 in theposition where roller 4b is rotated by the continuously rotating driveroller 5. The brakes 17 and 18 are simultaneously released. The rotationof the roller 4b is thus reversed from it normal operation direction;i.e., when roller 4a is in contact with the roller 5, and in this event,will cause the thread 3 to be pulled downwardly. The slot 39 is of alength that after latch 23 engages the lever, the actuator 28 may bereturned to its forward or original position.

Through the aforedescribed switching process, the thread 3 with its endis moved backwardly through the tube 8 into the spinning chamber withoutreversal of any of the drive means or special operation of the otherparts. At the instant the backwardly moving out thread 3 passes thephoto sensor 2, a new impulse signal is sent to the control circuit. Thecontrol circuit in turn causes the coupling 25 to close, and thesolenoid actuator 28 to release the housing all of which places thefiber feed rollers 26, the picker 33 and the spinning turbine back intoaction, even while the thread reverses. Simultaneously, an adjustableimpulse generator 37 which is driven by the common drive 5 closes andbegins producing a series of impulses.

The fiber fed from the feed rollers 26 is spun, in conventional mannerby centrifugal action against the inner wall of the spinning turbine 9,and is drawn off from the so called binding or splicing point which isfixed within the general limits on the face of the spinning wall. Theconstant path and distance over which cut thread 3 must be returnedbetween the thread sensor 2 and the binding point of the spinningturbine can be compared with a multiple of impulses generated by theimpulse, generator 37, which multiple can be prede' termined. Thus,after a predetermined number of pulses indicative of the time necessaryfor the thread to come back to the binding point and automaticallysplice itself, the control circuit is caused to energize a magnet 34which lifts the latch 23 releasing the lever 16, which for all thepreceding time was holding roller 4b against the drive roller 5. Onrelease of lever 16 roller 4b is freed allowing the roller 4a to returninto contact with the drive 5, thus placing the entire apparatus backinto its normal production position as shown originally in FIG. 1.During switching back to normal operation, the take-up roller 21 slipsover the grooved drum l0, permitting the dancer arm 11 to rebuildadequate reserve yarn. The dancer arm 11 also acts to simultaneouslyprevent the edge of the spool 21 from hardening which through thelateral deflection of the thread relative to the winding of the spool.By taking up the thread, the dancer arm relieves the pressure whichwould accur at the edges of the spool due to the greater distance of theedges from the rollers 4a, 4b by yieldably moving to the left in thedrawings.

it is to be noted that the brakes 17 and 18, as well as the magneticallyoperated latch 23, are auxilliary means to insure the operation of thedevice, particularly, the levers within a time range of milli-seconds.These elements known may be omitted, if the actuator solenoid device 19can be found which itself operates in an extremely short period of time.It is also to be noted that the belt or chain 14 connecting the drive ofthe rollers with the grooved drum 10 is held under proper tension bytensioning roller resiliently spring biased, to compensate for thechanges in distance during the swing of roller 14.

From the foregoing description it will be clear that the inventivemethod and apparatus provides extremely short periods of switchingtimes. Thus, the time in which the pull rollers are actually stopped isextremely short and virtually instantaneous. The parts have relativelysmall size and mass and the clamping point of the thread between the tworollers 4a and 4b, as defined by the associated levers, having a commonpivotal point, is easily determined. Consequently, irregularities instarting and stopping of the drive means for withdrawing and reversingthe thread have little effect on the proper alignment. Further, the factthat the cut thread end arrives at the sensor, only after the drivemeans have reached peak power and have stabilized, insures that theimpulses generated are an accurate time indication of the distance thethread travels. As a result, the present device insures that the tip ofthe thread reverses in time so that it meets exactly the binding pointof the fiber ring or fiber tow formed in the spinning chamber.

It will be seen from the foregoing that the thread end is cut at apredetermined distance from the spinning chamber and its reversal istimed with the reactivation of the spinning operation, (i.e., feed andturbine spin) so that the thread reaches the chamber just as the spunfiber makes a cohesive, fully dense rope or tow at the chamber bindingpoint. Thus, the joining of the thread and fiber makes a smoothcontinuous and nearly perfect thread juncture. This timing is, ofcourse, accomplished by the fact that the counting of the impulsesbegins only when the cut thread passes the sensor, and not at the timeit reverses.

The present disclosure is illustrative and should not be taken aslimiting of the present invention.

The application is a companion to and relates to apparatus shown anddescribed in each of the following US. applications, all filed on evendate hereof and reference is made to the specifications, claims anddrawings of each and their disclosures incorporated herein,

as if more fully set out herein:

Ser. No. 264,528 corres. to German Appln. P 21 30 739.1, Wilhelm Braun,Mounting Apparatus for Spinning Assembly Ser. No. 264,529 corres. toGerman Appln. P 2l 30 722.2, Rudolf Schtin, Apparatus for theSpindleless Spinning, now US. Pat. No. 3,789,597

Ser. No. 264,530 corres. to German Appln. P 21 30 738.0, GerhardBartling Device for Open End Spinning, now US. Pat. No. 3,789,990

Ser. No. 264,531 corres. to German Appln. P 21 30 -724.4, Rudof Schon,Apparatus for Withdrawing Thread, now US. Pat. No. 3,778,989

Ser. No. 264,450 corres. to German Appln. P 21 30 725.5, GerhardBartling, Multi-unit Spinning Machines, now US. Pat. No. 3,774,382

The German applications were all filed on June 21, 1971. The assignee iscommon to all.

Finally, it should be indicated that the abovementioned electriccircuitry as far as it is not described in detail may be designed in anyusual and convenient manner as known to those skilled in the art ofelectric, electromechanic and electronic devices.

More specifically the impulse counter could be comprised of one or moreof the well known'counting relais. Of course, it would also be possibleto take an electronic counting device provided, however, that suitableamplifiers are connected between the counting device of the pulses andits associated devices, e.g., solenoid switches in the control device.

What is claimed:

1. A method for rejoining a broken thread with the spinning fibers in aspindleless spinning machine having a chamber to which the fibers arefed, a turbine for spinning said fibers and means for withdrawing saidfibers, comprising the steps of sensing the movement of said withdrawnthread, producing a first signal responsive to a break in said thread,and in response to said signal initiating an automatic program forsequentially stopping the withdrawal of said thread, cutting a portionfrom the end of said thread, reversing the movement of said thread tosaid chamber, producing a second signal responsive to the reversemovement of said cut end, producing a series of impulses in response tosaid second signal, and after a predetermined number of said impulsesrecommencing the withdrawal of said thread.

2. The method according to claim 1 including the step of withdrawing andreturning to said chamber said thread at the same speed.

3. The method according to claim 2 including the step of arresting thespinning and feeding of fibers in response to the first signal andrecommencing the spinning and feeding thereof in response to said secondsig nal.

4. The method according to claim 2 including the step of timing saidimpulses so that the distance said thread reverses from the productionof said second signal to said spinning chamber equals the time requiredto spin said fibers in said chamber into a cohesive thread.

5. A spindless spinning machine comprising a chamber, means for feedingfibers to said chamber, a rotating turbine located in said chamber, forspinning said fibers into thread and means for withdrawing said thread,means for sensing said withdrawn thread, means for producing a firstsignal responsive to the sensing of a break therein, means responsive tosaid first signal to sequentially stop said withdrawing means, means forcutting a portion from the end of said thread and means for causing saidwithdrawing means to reverse and return said cut thread to said chamberfor joining with said spinning fibers, said cut thread being moved pastsaid sensing means, means for producing a second signal in response tothe reverse movement of said cut thread past said sensing means, saidsensing means producing a predetermined number of impulses in responseto said second signal, and said withdrawing means being responsive tothe last of said predetermined number of impulses to again reverse saidwithdrawing means to recommence withdrawl of said joined thread fromsaid chamber.

6. The apparatus according to claim 5 wherein the means for withdrawinga returning said thread comprises a pair of rollers each mounted on alever resiliently biased against each other to hold the threadtherebetween, said rollers having the same diameter, a drive rollercontinuously rotating in one direction, and means normally maintainingone roller in sole contact with said drive roller for selectivelywithdrawing said thread and shifting the other roller into sole contactwith said drive roller for reversing said thread.

7. The apparatus according to claim 6 including an impulse generatormechanically connected to said drive means for producing a steady streamof reference impulses.

8. The apparatus according to claim 6 including a control circuitresponsive to said first signal, a control actuator for moving saidlevers, said circuit providing a signal for said actuator.

9. The apparatus according to claim 6 including a thread take-up spooland a thread guide drum interposed between said rollers and said threadtake-up spool, said spool resting on said guide drum and being driventhereby, and transmission means connecting said guide drum with saidrollers for conjoint rotation.

10. The apparatus according to claim 9 including a dancer arm fortaking-up thread responsive to the pull on said thread, located betweensaid rollers and said guide drum.

11. The apparatus according to claim 5 wherein said cutting means islocated a predetermined distance from said spinning chamber and saidimpulse generator is caused to produce a number of impulses conformingto said distance in time.

12. The apparatus according to claim 1 1 wherein said means for sensingsaid thread is located at a predetermined distance from said cuttingmeans and said counting of said impulses is initiated at the moment saidout thread passes said sensing means.

1. A method for rejoining a broken thread with the spinning fibers in aspindleless spinning machine having a chamber to which the fibers arefed, a turbine for spinning said fibers and means for withdrawing saidfibers, comprising the steps of sensing the movement of said withdrawnthread, producing a first signal responsive to a break in said thread,and in response to said signal initiating an automatic program forsequentially stopping the withdrawal of said thread, cutting a portionfrom the end of said thread, reversing the movement of said thread tosaid chamber, producing a second signal responsive to the reversemovement of said cut end, producing a series of impulses in response tosaid second signal, and after a predetermined number of said impulsesrecommencing the withdrawal of said thread.
 2. The method according toclaim 1 including the step of withdrawing and returning to said chambersaid thread at the same speed.
 3. The method according to claim 2including the step of arresting the spinning and feeding of fibers inresponse to the first signal and recommencing the spinning and feedingthereof in response to said second signal.
 4. The method according toclaim 2 including the step of timing said impulses so that the distancesaid thread reverses from the production of said second signal to saidspinning chamber equals the time required to spin said fibers in saidchamber into a cohesive thread.
 5. A spindless spinning machinecomprising a chamber, means for feeding fibers to said chamber, arotating turbine located in said chamber, for spinning said fibers intothread and means for withdrawing said thread, means for sensing saidwithdrawn thread, means for producing a first signal responsive to thesensing of a break therein, means responsive to said first signal tosequentially stop said withdrawing means, means for cutting a portionfrom the end of said thread and means for causing said withdrawing meansto reverse and return said cut thread to said chamber for joining withsaid spinning fibers, said cut thread being moved past said sensingmeans, means for producing a second signal in response to the reversemovement of said cut thread past said sensing means, said sensing meansproducing a predetermined number of impulses in response to said secondsignal, and said withdrawing means being responsive to the last of saidpredetermined number of impulses to again reverse said withdrawing meansto recommence withdrawl of said joined thread from said chamber.
 6. Theapparatus according to claim 5 wherein the means for withdrawing areturning said thread comprises a pair of rollers each mounted on alever resiliently biased against each other to hold the threadtherebetween, said rollers having the same diameter, a drive rollercontinuously rotating in one direction, and means normally maintainingone roller in sole contact with said drive roller for selectivelywithdrawing said thread and shifting the other roller into sole contactwith said drive roller for reversing said thread.
 7. The apparatusaccording to claim 6 including an impulse generator mechanicallyconnected to said drive means for producing a steady stream of referenceimpulses.
 8. The apparatus according to claim 6 including a controlcircuit responsive to said first signal, a control actuator for movingsaid levers, said circuit providing a signal for said actuator.
 9. Theapparatus according to claim 6 including a thread take-up spool and athread guide drum interposed between said rollers and said threadtake-up spool, said spool resting on said guide drum and being driventhereby, and transmission means connecting said guide drum with saidrollers for conjoint rotation.
 10. The apparatus according to claim 9including a dancer arm for taking-up thread responsive to the pull onsaid thread, located between said rollers and said guide drum.
 11. Theapparatus according to claim 5 wherein said cutting means is located apredetermined distance from said spinning chamber and said impulsegenerator is caused to produce a number of impulses conforming to saiddistance in time.
 12. The apparatus according to claim 11 wherein saidmeans for sensing said thread is located at a predetermined distancefrom said cutting means and said counting of said impulses is initiatedat the moment said cut thread passes said sensing means.